<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./vue.js"></script>
    <style>
        .box {
            width: 100px;
            height: 30px;
            background-color: pink;
        }

        .red {
            background-color: red;
        }

        .yellow {
            background-color: yellow;
        }

        .blue {
            background-color: blue;
        }
    </style>
</head>

<body>
    <div id="app">
        <!-- 1.直接赋值一个变量 -->
        <div :class="classname">box</div>

        <!-- 2.在两个类名之间选择一个 -->
        <ul>
            <li :class="item % 2 == 1 ? 'red' :'yellow'" v-for="(item) in 6">
                {{ item }}
            </li>
        </ul>

        <ul>
            <li :class="[item % 2 == 1 ? 'red' : 'yellow']" v-for="item in 6">
                {{ item }}
            </li>
        </ul>

        <!-- 
            3.在多个类名之间选择一个
                <html标签 :class="{类名:布尔值，类名:布尔值 ......}"></html标签>
         -->

        <ul>
            <li :class="{'red':item % 3 == 1,blue:item % 3 == 2,yellow:item % 3 == 0}" v-for="item in 9">{{ item }}</li>
        </ul>
    </div>

    <script>
        new Vue({
            el: '#app',
            data: {
                classname:'box'
            }
        })
    </script>
</body>

</html>